很多时候，当代码更改后Play重新加载应用程序时，我收到以下错误：
MongoError ['无法访问节点集！请检查您的网络 连接。']
MongoDB日志如下所示：
2016-09-06T18:51:22.609+0200 I NETWORK [initandlisten] waiting for connections on port 27017
2016-09-06T18:53:49.916+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:60559 #1 (1 connection now open)
2016-09-06T18:53:51.185+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:60561 #2 (2 connections now open)
2016-09-06T18:53:51.196+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:60562 #3 (3 connections now open)
2016-09-06T18:53:51.206+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:60563 #4 (4 connections now open)
2016-09-06T18:53:51.217+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:60564 #5 (5 connections now open)
2016-09-06T18:53:51.227+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:60565 #6 (6 connections now open)
2016-09-06T18:53:51.237+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:60566 #7 (7 connections now open)
2016-09-06T18:53:51.248+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:60567 #8 (8 connections now open)
2016-09-06T18:53:51.258+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:60568 #9 (9 connections now open)
2016-09-06T18:53:51.269+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:60569 #10 (10 connections now open)
2016-09-06T18:53:59.533+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:60577 #11 (11 connections now open)
2016-09-06T18:53:59.546+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:60578 #12 (12 connections now open)
2016-09-06T18:53:59.557+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:60579 #13 (13 connections now open)
2016-09-06T18:53:59.568+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:60580 #14 (14 connections now open)
2016-09-06T18:53:59.579+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:60581 #15 (15 connections now open)
2016-09-06T18:53:59.589+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:60582 #16 (16 connections now open)
2016-09-06T18:53:59.600+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:60583 #17 (17 connections now open)
2016-09-06T18:53:59.610+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:60584 #18 (18 connections now open)
2016-09-06T18:53:59.620+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:60585 #19 (19 connections now open)
2016-09-06T19:37:21.594+0200 I NETWORK [conn11] end connection 127.0.0.1:60577 (18 connections now open)
2016-09-06T19:37:21.596+0200 I NETWORK [conn1] end connection 127.0.0.1:60559 (17 connections now open)
2016-09-06T19:37:21.597+0200 I NETWORK [conn15] end connection 127.0.0.1:60581 (16 connections now open)
2016-09-06T19:37:21.597+0200 I NETWORK [conn13] end connection 127.0.0.1:60579 (15 connections now open)
2016-09-06T19:37:21.597+0200 I NETWORK [conn16] end connection 127.0.0.1:60582 (14 connections now open)
2016-09-06T19:37:21.598+0200 I NETWORK [conn12] end connection 127.0.0.1:60578 (13 connections now open)
2016-09-06T19:37:21.598+0200 I NETWORK [conn19] end connection 127.0.0.1:60585 (13 connections now open)
2016-09-06T19:37:21.599+0200 I NETWORK [conn17] end connection 127.0.0.1:60583 (11 connections now open)
2016-09-06T19:37:21.599+0200 I NETWORK [conn14] end connection 127.0.0.1:60580 (11 connections now open)
2016-09-06T19:37:21.600+0200 I NETWORK [conn18] end connection 127.0.0.1:60584 (9 connections now open)
2016-09-06T19:37:21.607+0200 I NETWORK [conn5] end connection 127.0.0.1:60564 (9 connections now open)
2016-09-06T19:37:21.607+0200 I NETWORK [conn9] end connection 127.0.0.1:60568 (9 connections now open)
2016-09-06T19:37:21.608+0200 I NETWORK [conn6] end connection 127.0.0.1:60565 (9 connections now open)
2016-09-06T19:37:21.608+0200 I NETWORK [conn10] end connection 127.0.0.1:60569 (9 connections now open)
2016-09-06T19:37:21.609+0200 I NETWORK [conn2] end connection 127.0.0.1:60561 (9 connections now open)
2016-09-06T19:37:21.609+0200 I NETWORK [conn7] end connection 127.0.0.1:60566 (9 connections now open)
2016-09-06T19:37:21.610+0200 I NETWORK [conn3] end connection 127.0.0.1:60562 (9 connections now open)
2016-09-06T19:37:21.611+0200 I NETWORK [conn4] end connection 127.0.0.1:60563 (4 connections now open)
2016-09-06T19:37:21.612+0200 I NETWORK [conn8] end connection 127.0.0.1:60567 (0 connections now open)
2016-09-06T19:37:22.326+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:62077 #20 (1 connection now open)
2016-09-06T19:37:22.333+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:62078 #21 (2 connections now open)
2016-09-06T19:37:22.333+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:62079 #22 (3 connections now open)
2016-09-06T19:37:22.343+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:62080 #23 (4 connections now open)
2016-09-06T19:37:22.344+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:62081 #24 (5 connections now open)
2016-09-06T19:37:22.344+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:62082 #25 (6 connections now open)
2016-09-06T19:37:22.344+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:62083 #26 (7 connections now open)
2016-09-06T19:37:22.344+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:62084 #27 (8 connections now open)
2016-09-06T19:37:22.354+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:62085 #28 (9 connections now open)
2016-09-06T19:37:22.355+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:62086 #29 (10 connections now open)
2016-09-06T19:37:32.348+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:62105 #30 (11 connections now open)
2016-09-06T19:37:32.359+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:62106 #31 (12 connections now open)
2016-09-06T19:37:32.393+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:62107 #32 (13 connections now open)
2016-09-06T19:37:32.399+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:62108 #33 (14 connections now open)
2016-09-06T19:37:32.399+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:62109 #34 (15 connections now open)
2016-09-06T19:37:32.399+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:62110 #35 (16 connections now open)
2016-09-06T19:37:32.399+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:62111 #36 (17 connections now open)
2016-09-06T19:37:32.401+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:62112 #37 (18 connections now open)
2016-09-06T19:37:32.401+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:62113 #38 (19 connections now open)
有时也有这个例外：
[warn] r.c.a.MongoDBSystem - The entire node set is unreachable, is there a network problem?
[warn] r.c.a.MongoDBSystem - The entire node set is unreachable, is there a network problem?
[error] r.api.Failover2 - Got an error, no more attempts to do. Completing with a failure...
reactivemongo.core.actors.Exceptions$PrimaryUnavailableException$: MongoError['No primary node is available!']
at reactivemongo.core.actors.Exceptions$PrimaryUnavailableException$.<clinit>(actors.scala)
at reactivemongo.core.actors.MongoDBSystem$$anonfun$reactivemongo$core$actors$MongoDBSystem$$pickChannel$4.apply(actors.scala:748)
at reactivemongo.core.actors.MongoDBSystem$$anonfun$reactivemongo$core$actors$MongoDBSystem$$pickChannel$4.apply(actors.scala:748)
at scala.Option.getOrElse(Option.scala:121)
at reactivemongo.core.actors.MongoDBSystem$class.reactivemongo$core$actors$MongoDBSystem$$pickChannel(actors.scala:748)
at reactivemongo.core.actors.MongoDBSystem$$anonfun$4.applyOrElse(actors.scala:340)
at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:170)
at akka.actor.Actor$class.aroundReceive(Actor.scala:482)
at reactivemongo.core.actors.LegacyDBSystem.aroundReceive(actors.scala:896)
at akka.actor.ActorCell.receiveMessage(ActorCell.scala:526)
[error] r.api.Failover2 - Got an error, no more attempts to do. Completing with a failure...
reactivemongo.core.actors.Exceptions$PrimaryUnavailableException$: MongoError['No primary node is available!']
at reactivemongo.core.actors.Exceptions$PrimaryUnavailableException$.<clinit>(actors.scala)
at reactivemongo.core.actors.MongoDBSystem$$anonfun$reactivemongo$core$actors$MongoDBSystem$$pickChannel$4.apply(actors.scala:748)
at reactivemongo.core.actors.MongoDBSystem$$anonfun$reactivemongo$core$actors$MongoDBSystem$$pickChannel$4.apply(actors.scala:748)
at scala.Option.getOrElse(Option.scala:121)
at reactivemongo.core.actors.MongoDBSystem$class.reactivemongo$core$actors$MongoDBSystem$$pickChannel(actors.scala:748)
at reactivemongo.core.actors.MongoDBSystem$$anonfun$4.applyOrElse(actors.scala:340)
at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:170)
at akka.actor.Actor$class.aroundReceive(Actor.scala:482)
at reactivemongo.core.actors.LegacyDBSystem.aroundReceive(actors.scala:896)
at akka.actor.ActorCell.receiveMessage(ActorCell.scala:526)
[error] r.api.Failover2 - Got an error, no more attempts to do. Completing with a failure...
reactivemongo.core.actors.Exceptions$PrimaryUnavailableException$: MongoError['No primary node is available!']
at reactivemongo.core.actors.Exceptions$PrimaryUnavailableException$.<clinit>(actors.scala)
at reactivemongo.core.actors.MongoDBSystem$$anonfun$reactivemongo$core$actors$MongoDBSystem$$pickChannel$4.apply(actors.scala:748)
at reactivemongo.core.actors.MongoDBSystem$$anonfun$reactivemongo$core$actors$MongoDBSystem$$pickChannel$4.apply(actors.scala:748)
at scala.Option.getOrElse(Option.scala:121)
at reactivemongo.core.actors.MongoDBSystem$class.reactivemongo$core$actors$MongoDBSystem$$pickChannel(actors.scala:748)
at reactivemongo.core.actors.MongoDBSystem$$anonfun$4.applyOrElse(actors.scala:340)
at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:170)
at akka.actor.Actor$class.aroundReceive(Actor.scala:482)
at reactivemongo.core.actors.LegacyDBSystem.aroundReceive(actors.scala:896)
at akka.actor.ActorCell.receiveMessage(ActorCell.scala:526)
当我完全杀死进程并再次执行activator run时，一切都像以前一样。
以下是我如何使用ReactiveMongo：
val collection: Future[JSONCollection] = reactiveMongoApi.database.map(_.collection[JSONCollection](collectionName))
二手版本：
由于这样的开发需要永远，我将非常感谢帮助解决这个问题！ ： - ）